Debug: expose full raw booking in debug-room; fix guest name extraction

- debug-room now returns full raw NewBook booking objects so all
  field names are visible for diagnosis
- guest_name extraction also tries guests[0].firstname+lastname
  (original PHP plugin pattern), not just guests[0].guest_name

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/routes/rooms.js

@@ -44,7 +44,11 @@ function filterBookingData(booking, canSeeGuest, canSeeRate, canSeeAllNotes, vis
 
   if (canSeeGuest) {
     const guests = booking.guests || []
-    out.guest_name = guests[0]?.guest_name || booking.guest_name || booking.account_for_name || null
+    const g0 = guests[0]
+    const fromGuests = g0
+      ? (g0.guest_name || [g0.firstname, g0.lastname].filter(Boolean).join(' ') || null)
+      : null
+    out.guest_name = fromGuests || booking.guest_name || booking.account_for_name || null
   }
 
   if (canSeeRate) {
@@ -119,13 +123,7 @@ export async function roomRoutes(app) {
       site: { id: siteId, name: site.site_name, fields: Object.keys(site) },
       booking_id_fields: idFields,
       total_bookings_fetched: bookings.length,
-      matching_bookings: siteBookings.map(b => {
-        const out = {}
-        for (const f of ['booking_id', 'booking_status', 'booking_arrival', 'booking_departure', ...idFields]) {
-          out[f] = b[f]
-        }
-        return out
-      }),
+      matching_bookings: siteBookings,
       classified: {
         flow_type:       classified.flow_type,
         spans_previous:  classified.spans_previous,